Leyi bissell



` drawing, making a'part ofthis specifica- NUNITED sTATEs PATENT oEEicE.

LEVI BISSELL, OF NEW YORK, N. Y.

Y CARRIAGE-SPRING'.

Specification of Letters Patent No. 8,105, dated May 20, 18511.

following is a full',clear, and exact descrip- .tion ofthe constructionand operation of the same, reference beinghad to the annexed tion, inwhichi Figure l, is an edge view in the form of a common ellipticspring; Fig. 2, represents what may be called an inverted d ellipticspring; Fig. 3, is a different forni to which my mode of construction isadapted; Fig. (l,

is a view of the convex side of an elliptic spring,Y and Fig. (5, is aspring of a somewhat diierent constructionLwhere the same principle iscontained. i

I propose tomakemy spring ofvwood using for the purpose good ,strong andseasoned hickory, oak, ash, or other strong wood; the springis dressedto a proper size and'of such a taper. as when pressed upon,V

bends equally in its whole length.` I then cut saw kei-fs (see a, a,&c.) square across the spring at about two inchesapart (more or less),cutting suchkerfs about two thirds (more` or less) through the spring;these saw kerfs are filled in with strips of metal, wood, or other hardsubstances, if for a rigid, and with elastic substances, for a moreelastic spring; which are forced in sufficiently tight to bring thespringto a proper curve, or compass desired, in the unstra-ined spring.To prevent the parts of the spring between the strips from parting fromthe saine, I put a rivet (see Z), I), &c.) through each of them asrepresented in Figs. 4 and 5, and to prevent the strips from `droppingout, if by any means they should become loose I let a corner of the buron the ends of the rivet, extend a little over the strips. I

When the spring is required to sustain a very heavy pressure, it may benecessary to strengthen it by a plate of steel or other metal to run theWhole length of the spring,

to be securely riveted on the concave side of the spring as representedin Fig. 2.

The spring represented at Fig. 5, consists of a plate/oit' steel or ofother metal, set to the proper curve, on which is rinly riveted orbolted a succession of blocks of hard wood, or other hard substance, thevblocks being so fitted to each other Aas to form close joints asrepresented at Fig. 5, orsuch blocks may be iitted so as to leave spacestoV be filled with either hard or elastic substance as represented atFig. 4.

It will be perceived, by reference to the foregoing description anddrawings, that when force is applied to the spring, it will tend to,close such kerfs, which will produce a strong pressure on the stripswith which the kei-fs are filled, such strips acting as braces to eachother at that side o the spring, causing a lengthwise tension at theopposite side of the spring, and if made of wood, will be in thedirection of the fiber, and that nothing sho-rt of a. force sufticientto pull apart the liber in a lengthwise tension, can cause it to giveaway. It will be seen also, that rigidity or elasticity may be stanceiilling the kerf, more or less, the same spring may be adapted to anygiven load, or purpose.

Vhat I claim as new and desire to secure by Letters Patent is- Theconstruction of springs, whether of wood, or part wood and part metal,or other elastic or nonelastic substances, as adapted and applicable tocarriage springs, and springs for `other purposes, in the mannersubstantially as herein described.

LEVI BISSELL. In the presence of- I. S. SMITH, E. G. HANDY.

